Do babies need hats in June?

I dunno. While I'm on the questions, how big is a typical baby's head? I went to a baby shower today, and I did not provide a hat for the baby! I know, darling readers, this shocking revelation must have knocked the wind right out of you. I started a hat, and it seemed small enough, but then I decided the yarn was more textured than I'd want a baby to have to wear. I just couldn't wrap my mind around the whole baby-head-hat-June concept, plus there have been no babies handy when I have a measuring tape in hand. So now I am going to wait until after I meet the baby to make the hat - is that weird? Oh, well.